My theory is that the discount is precisely because of the sign. I am convinced that that part does 99% of the work at actually deterring crime. The local alarm

My theory is that the discount is precisely because of the sign. I am convinced that that part does 99% of the work at actually deterring crime. The local alarm won't do anything once you are in the building: just go and turn it off. In fact, get a shirt with the ADT logo, then go rob a house. Nobody will question it.